Sonochemical Oxidation of Arsenite in Aqueous Phase

Cui, Mingcan; Lee, Seban; Jang, Min; Kweon, Boyoun; Jo, Hwanju; Khim, Jong Seong

doi:10.7567/jjap.50.07he13

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…Thus, at least 50%, and perhaps more, As-bound Fe plaque was removed with gentle sonication (i.e., 20 kHz for 2 h). This compromise in duration and power of sonics was an advantage for minimizing As(III) oxidation, which can occur up to 10% when sonicated at over 180 kHz . It should be noted that the intent of the present approach was not to remove all plaques, but to assess whether soil treatments (i.e., Si amendments) would cause global changes in Fe plaque phases, as current methods to spot-check micrometer-scale areas on root-bound plaque are simply not feasible to answer that question due to the heterogeneity of root plaque and low signal-to-noise.…”

Section: Discussionmentioning

confidence: 98%

“…This compromise in duration and power of sonics was an advantage for minimizing As(III) oxidation, which can occur up to 10% when sonicated at over 180 kHz. 36 It should be noted that the intent of the present approach was not to remove all plaques, but to assess whether soil treatments (i.e., Si amendments) would cause global changes in Fe plaque phases, as current methods to spotcheck micrometer-scale areas on root-bound plaque are simply not feasible to answer that question due to the heterogeneity of root plaque and low signal-to-noise. Because the plaque removed represented a large fraction of the outer plaque that As-bearing rhizosphere solution would encounter during solute delivery to the root, the present technique is an advance over existing methods.…”

Section: ■ Discussionmentioning

confidence: 99%

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A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

Amaral

Lopes

Guilherme

et al. 2016

Environ. Sci. Technol.

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The Fe (oxyhydr)oxide rind, or Fe plaque, that forms on aquatic plant roots is an important sorbent of metal(loid)s and plays a role in the attenuation of metal(loid) uptake into higher plants. However, the mineral composition of Fe plaque and thus its potential to sorb metal(loid)s is affected by solution chemistry. The predominant strategy to characterize Fe plaque using dithionite-citrate-bicarbonate (DCB) extraction and elemental analysis reveals total Fe quantity but misses the mineral structure of the Fe (oxyhydr)oxide. Here, we developed a new technique using gentle sonication to sample intact Fe plaque from the root system and concentrate it for subsequent mineralogical characterization using synchrotron-based X-ray diffraction and X-ray absorption spectroscopy. We then coupled that data with conventional DCB extraction. The sample preparation method was effective at concentrating As-bound Fe plaque minerals in a uniform coating onto membranes that could easily be analyzed with X-ray techniques. Using these methods, we show that the percentage of poorly ordered Fe minerals in Fe plaque increases with increasing pore-water Si in flooded rice paddy soils. These findings have implications for understanding mineral controls on As cycling in the soil-rice nexus, and the sampling approach can be adopted for other aquatic plant systems.

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Section: Discussionmentioning

confidence: 98%

Section: ■ Discussionmentioning

confidence: 99%

A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

Amaral

Lopes

Guilherme

et al. 2016

Environ. Sci. Technol.

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“…(3) and ( 5)]. [29][30][31][32][33][34][35][36][37] Furthermore, the radicals contribute to the oxidation of the divalent iron in the precursor in the early stages of synthesis, which is considered to be the cause of scorodite's rapid crystal growth.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of porous γ-Fe₂O₃ from scorodite synthesized using ultrasound irradiation and evaluation of its battery performance

Kitamura

Okawa

Shinoda

et al. 2022

Jpn. J. Appl. Phys.

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The effect of 200 kHz ultrasound on scorodite synthesis at 70 °C and 3 h reaction conditions was investigated using sulfuric acidic solutions of various pH (3.0, 2.0, 1.5, 1.0, and 0.0). In contrast to the case of only O2 gas flow without ultrasound irradiation, oxidizing radicals generated by ultrasound irradiation promote Fe(II) oxidation in solution and precursor, allowing scorodite to synthesize with high crystallinity (>99%), which relates to low solubility, even in strong acid solution at pH 1.0. During synthesis, particle shape was changed to polyhedral or spindle type depending on the pH of 0.0 to 3.0. The spindle-shaped scorodite was probably formed by the decrease of precursor amount produced in initial stage of the synthesis. Furthermore, porous maghemite obtained by alkali treatment of scorodite showed initial discharge capacities of 146 mAh/g (polyhedron) and 167 mAh/g (spindle), indicating that its potential use as a cathode material for lithium-ion batteries.

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“…The use of ultrasound for the oxidation of As(III) was reported previously. [15][16][17][18][19][20][21] It was found that while ultrasound is effective for the oxidation of As(III) to As(V), Ascontaining solutions gradually become acidic under ultrasound irradiation. This prevents the use of adsorbents that dissolve in the acidic solution, such as ferric hydroxide.…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenious acid from sulfuric acidic solution using ultrasound oxidation and goethite

Okawa

Yoshikawa

Hosokawa

et al. 2015

Jpn. J. Appl. Phys.

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We investigated the properties of synthetic goethite for the adsorption of As from strongly acidic solutions in ambient atmosphere under ultrasound irradiation. The goethite was successfully synthesized from iron-containing sulfuric acidic solution (1271 ppm) using an autoclave apparatus for 1 h at 0.12 MPa and 121 °C. The ratio of the iron eluted from the synthetic goethite to the acidic solution was only 0.58% at pH 2.1. Ultrasound irradiation (200 kHz, 200 W) was applied to oxidize 10 ppm of As(III) to As(V) at pH 2.2 for 60 min under various atmospheric conditions. Remarkably, the oxidation ratio of As(III) to As(V) is quite high (89.7%) at pH 2.2 in ambient atmosphere and is close to those obtained for Ar (95.3%) and O2 (95.9%) atmospheres. The As(III) removal ratio reached 94.5% after 60 min of irradiation. Therefore, goethite is a promising material for As adsorption using ultrasound oxidation in the acidic region in ambient atmosphere.

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Sonochemical Oxidation of Arsenite in Aqueous Phase

Cited by 7 publications

References 17 publications

A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

Synthesis of porous γ-Fe₂O₃ from scorodite synthesized using ultrasound irradiation and evaluation of its battery performance

Removal of arsenious acid from sulfuric acidic solution using ultrasound oxidation and goethite

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Sonochemical Oxidation of Arsenite in Aqueous Phase

Cited by 7 publications

References 17 publications

A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

Synthesis of porous γ-Fe2O3 from scorodite synthesized using ultrasound irradiation and evaluation of its battery performance

Removal of arsenious acid from sulfuric acidic solution using ultrasound oxidation and goethite

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Synthesis of porous γ-Fe₂O₃ from scorodite synthesized using ultrasound irradiation and evaluation of its battery performance